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在Zr-Sn-Nb系合金的基础上添加微量合金元素Ge和Si等,采用真空电弧熔炼,制备了多种新锆合金。使用透射电子显微镜(Transmission electron microscope,TEM)对合金基体进行显微组织分析,分别通过堆外高压釜腐蚀试验、定氢分析仪和万能材料试验机对合金的腐蚀、吸氢和拉伸性能进行评估。结果表明,常规工艺处理后,SZA-4和SZA-6合金均发生了完全再结晶,第二相细小、均匀弥散分布在晶粒内和晶界上;SZA-4和SZA-6合金在三种水化学条件下均具有优良的耐腐蚀性能,SZA-6合金的耐腐蚀性能优于参考合金,SZA-4合金的耐腐蚀性能略优于SZA-6合金;SZA-6合金的吸氢性能略优于SZA-4合金;两种合金的拉伸性能满足设计要求。基于SZA-4和SZA-6合金优良的耐腐蚀、吸氢和力学性能,未来将有望用于CAP1400自主化燃料组件。
Based on the Zr-Sn-Nb alloy, a series of new zirconium alloys were prepared by adding trace amounts of alloying elements, such as Ge and Si, by vacuum arc melting. The microstructure of the alloy substrate was analyzed by using Transmission Electron Microscope (TEM). The corrosion, hydrogen absorption and tensile properties of the alloy were investigated by means of autoclave corrosion test, constant hydrogen analyzer and universal material testing machine respectively. Evaluation. The results show that the SZA-4 and SZA-6 alloys are completely recrystallized and the second phase is fine and homogeneously dispersed in the grain and grain boundaries after the conventional process. The corrosion resistance of SZA-6 alloy is better than that of the reference alloy, and the corrosion resistance of SZA-4 alloy is slightly better than that of SZA-6 alloy. The hydrogen absorption capacity of SZA-6 alloy Slightly better than the SZA-4 alloy; tensile properties of the two alloys to meet the design requirements. Based on the excellent corrosion resistance, hydrogen absorption and mechanical properties of SZA-4 and SZA-6 alloys, it is expected to be used in CAP1400 autonomous fuel assemblies in the future.